Yes, no one hurt, but the woman who was attempting to put the AC in was terribly shaken and felt horrible, thinking of what could have happened.
Those AC braces that are required by law are really important to use. They are not too expensive and not that difficult to install. They come in sizes, depending on the AC's weight.
Our building had an AC fall from a window into our rear garden nearly two years ago. Obviously the AC falling on 37th night a foot from the outdoor fruit display is far scarier.